1) Booting up did not always work well, one problem or another would come up and I'd have to try again.
2) Screen resolution automatically changed, couldn't set it back without rebooting.
3) Sometimes it would start lagging (not REAL bad, but bad enough to make PR2/3 difficult to play) and only fix was to reboot. Task Manager said no process was using any CPU, but that ~70% of one of the two cores was being continually used.
Also, Windows regularly gets updates. Why don't they ever fix ANYTHING? (I seriously can't remember noticing a single fix or improvement from those updates.)